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<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.adapted.define_struct"></a><a class="link" href="define_struct.html" title="BOOST_FUSION_DEFINE_STRUCT">BOOST_FUSION_DEFINE_STRUCT</a>
</h3></div></div></div>
<p>
        BOOST_FUSION_DEFINE_STRUCT is a macro that can be used to generate all the
        necessary boilerplate to define and adapt an arbitrary struct as a model
        of <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
        Access Sequence</a>.
      </p>
<h5>
<a name="fusion.adapted.define_struct.h0"></a>
        <span class="phrase"><a name="fusion.adapted.define_struct.synopsis"></a></span><a class="link" href="define_struct.html#fusion.adapted.define_struct.synopsis">Synopsis</a>
      </h5>
<pre class="programlisting"><span class="identifier">BOOST_FUSION_DEFINE_STRUCT</span><span class="special">(</span>
    <span class="special">(</span><span class="identifier">namespace0</span><span class="special">)(</span><span class="identifier">namespace1</span><span class="special">)...,</span>
    <span class="identifier">struct_name</span><span class="special">,</span>
    <span class="special">(</span><span class="identifier">member_type0</span><span class="special">,</span> <span class="identifier">member_name0</span><span class="special">)</span>
    <span class="special">(</span><span class="identifier">member_type1</span><span class="special">,</span> <span class="identifier">member_name1</span><span class="special">)</span>
    <span class="special">...</span>
    <span class="special">)</span>
</pre>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="identifier">str</span></code></span></dt>
<dd><p>
              An instance of <code class="computeroutput"><span class="identifier">struct_name</span></code>
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">e0</span></code>...<code class="computeroutput"><span class="identifier">en</span></code></span></dt>
<dd><p>
              Heterogeneous values
            </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">fs</span></code></span></dt>
<dd><p>
              A <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
              Sequence</a>
            </p></dd>
</dl>
</div>
<h5>
<a name="fusion.adapted.define_struct.h1"></a>
        <span class="phrase"><a name="fusion.adapted.define_struct.expression_semantics"></a></span><a class="link" href="define_struct.html#fusion.adapted.define_struct.expression_semantics">Expression
        Semantics</a>
      </h5>
<p>
        The above macro generates the necessary code that defines and adapts <code class="computeroutput"><span class="identifier">struct_name</span></code> as a model of <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
        Access Sequence</a>. The sequence <code class="computeroutput"><span class="special">(</span><span class="identifier">namespace0</span><span class="special">)(</span><span class="identifier">namespace1</span><span class="special">)...</span></code>
        declares the namespace for <code class="computeroutput"><span class="identifier">struct_name</span></code>.
        It yields to a fully qualified name for <code class="computeroutput"><span class="identifier">struct_name</span></code>
        of <code class="computeroutput"><span class="identifier">namespace0</span><span class="special">::</span><span class="identifier">namespace1</span><span class="special">::...</span>
        <span class="identifier">struct_name</span></code>. If an empty namespace
        sequence is given (that is a macro that expands to nothing), the struct is
        placed in the global namespace. The sequence of <code class="computeroutput"><span class="special">(</span><span class="identifier">member_typeN</span><span class="special">,</span>
        <span class="identifier">member_nameN</span><span class="special">)</span></code>
        pairs declares the type and names of each of the struct members that are
        part of the sequence.
      </p>
<p>
        The macro should be used at global scope. Semantics of an expression is defined
        only where it differs from, or is not defined in <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
        Access Sequence</a>.
      </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Expression
                </p>
              </th>
<th>
                <p>
                  Semantics
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">struct_name</span><span class="special">()</span></code>
                </p>
              </td>
<td>
                <p>
                  Creates an instance of <code class="computeroutput"><span class="identifier">struct_name</span></code>
                  with default constructed elements.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">struct_name</span><span class="special">(</span><span class="identifier">e0</span><span class="special">,</span>
                  <span class="identifier">e1</span><span class="special">,...</span>
                  <span class="identifier">en</span><span class="special">)</span></code>
                </p>
              </td>
<td>
                <p>
                  Creates an instance of <code class="computeroutput"><span class="identifier">struct_name</span></code>
                  with elements <code class="computeroutput"><span class="identifier">e0</span></code>...<code class="computeroutput"><span class="identifier">en</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">struct_name</span><span class="special">(</span><span class="identifier">fs</span><span class="special">)</span></code>
                </p>
              </td>
<td>
                <p>
                  Copy constructs an instance of <code class="computeroutput"><span class="identifier">struct_name</span></code>
                  from a <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
                  Sequence</a> <code class="computeroutput"><span class="identifier">fs</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">str</span> <span class="special">=</span>
                  <span class="identifier">fs</span></code>
                </p>
              </td>
<td>
                <p>
                  Assigns from a <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
                  Sequence</a> <code class="computeroutput"><span class="identifier">fs</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">str</span><span class="special">.</span><span class="identifier">member_nameN</span></code>
                </p>
              </td>
<td>
                <p>
                  Access of struct member <code class="computeroutput"><span class="identifier">member_nameN</span></code>
                </p>
              </td>
</tr>
</tbody>
</table></div>
<h5>
<a name="fusion.adapted.define_struct.h2"></a>
        <span class="phrase"><a name="fusion.adapted.define_struct.header"></a></span><a class="link" href="define_struct.html#fusion.adapted.define_struct.header">Header</a>
      </h5>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">adapted</span><span class="special">/</span><span class="keyword">struct</span><span class="special">/</span><span class="identifier">define_struct</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">define_struct</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<h5>
<a name="fusion.adapted.define_struct.h3"></a>
        <span class="phrase"><a name="fusion.adapted.define_struct.example"></a></span><a class="link" href="define_struct.html#fusion.adapted.define_struct.example">Example</a>
      </h5>
<pre class="programlisting"><span class="comment">// demo::employee is a Fusion sequence</span>
<span class="identifier">BOOST_FUSION_DEFINE_STRUCT</span><span class="special">(</span>
    <span class="special">(</span><span class="identifier">demo</span><span class="special">),</span> <span class="identifier">employee</span><span class="special">,</span>
    <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">name</span><span class="special">)</span>
    <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">age</span><span class="special">))</span>
</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman,
      Dan Marsden, Tobias Schwinger<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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